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    <title>Document</title>
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    <div id="p1" ay="阿雨">这是一个块</div>
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    console.log( $("div").attr("ay") );
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    $("div").attr("ay","这不是阿雨")
    $("div").prop("ay","这不是啊雨")
    console.log($("div").prop("id"));
    $("div").prop("id","prop1")
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